/* =========================================================
   Daniel Serrano Carrasco · Portada y páginas de asignatura
   Estilo inspirado en las páginas de producto de Apple:
   tipografía grande, mucho aire, animaciones ligadas al scroll.
   ========================================================= */

:root{
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Display","Inter","Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,"SF Mono","JetBrains Mono",Consolas,monospace;
  --bg:#fbfbfd;
  --bg-2:#f5f5f7;
  --card:#ffffff;
  --ink:#1d1d1f;
  --ink-2:#424245;
  --muted:#6e6e73;
  --line:#d2d2d7;
  --lime:#c8ef5c;
  --accent:#4a7d0a;          /* verde legible sobre claro */
  --cyan:#0f8f82;
  --grad:linear-gradient(100deg,#5aa000 0%,#0f9e8e 60%,#2a7de1 100%);
  --night:#000;
  --night-2:#161617;
  --night-ink:#f5f5f7;
  --night-muted:#a1a1a6;
  --shadow:0 2px 6px rgba(0,0,0,.04),0 18px 40px -18px rgba(0,0,0,.18);
  --shadow-lg:0 40px 80px -30px rgba(0,0,0,.35);
  --r:22px;
  --r-lg:30px;
  --ease:cubic-bezier(.22,.7,.18,1);
  color-scheme:light;
}
:root[data-theme="dark"]{
  --bg:#000;--bg-2:#0e0e10;--card:#161617;--ink:#f5f5f7;--ink-2:#d2d2d7;--muted:#a1a1a6;--line:#2d2d30;
  --accent:#c8ef5c;--cyan:#4fe0cd;--grad:linear-gradient(100deg,#c8ef5c 0%,#4fe0cd 55%,#7fb2ff 100%);
  --shadow:0 0 0 1px rgba(255,255,255,.06),0 18px 40px -18px rgba(0,0,0,.8);
  color-scheme:dark;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:70px}
body{margin:0;background:var(--bg);color:var(--ink);font:400 17px/1.5 var(--font);letter-spacing:-.011em;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden;transition:background .4s,color .4s}
img,svg{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;cursor:pointer;border:0;background:none;padding:0}
h1,h2,h3{margin:0;font-weight:700;letter-spacing:-.035em;line-height:1.05;text-wrap:balance}
p{margin:0;text-wrap:pretty}
::selection{background:var(--lime);color:#101b2c}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:8px}
.wrap{width:min(1180px,calc(100% - 44px));margin-inline:auto}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip-link{position:absolute;left:-999px;top:10px;z-index:10000;background:var(--lime);color:#101b2c;padding:10px 14px;border-radius:10px;font-weight:600}
.skip-link:focus{left:12px}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;-webkit-text-fill-color:transparent}
.eyebrow{display:block;font-size:clamp(.95rem,1.4vw,1.2rem);font-weight:600;color:var(--accent);letter-spacing:-.01em}
.section{padding:clamp(80px,12vw,150px) 0}
.section.alt{background:var(--bg-2)}
.section.tight{padding-top:0}
.headline{text-align:center;max-width:860px;margin:0 auto clamp(40px,6vw,72px)}
.headline h2{font-size:clamp(2.4rem,5.6vw,4.4rem);margin-top:10px}
.headline p{margin-top:18px;font-size:clamp(1.05rem,1.6vw,1.3rem);color:var(--muted);line-height:1.45}
.headline.left{text-align:left;margin-left:0}

/* ---------- Botones ---------- */
.ctas{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:14px 28px;margin-top:34px}
.pill{display:inline-flex;align-items:center;gap:8px;min-height:46px;padding:0 24px;border-radius:999px;background:var(--ink);color:var(--bg);font-weight:600;font-size:16px;transition:transform .25s var(--ease),box-shadow .25s,background .25s}
.pill:hover{transform:scale(1.03);box-shadow:0 10px 30px -10px rgba(0,0,0,.4)}
:root[data-theme="dark"] .pill{background:var(--lime);color:#101b2c}
.pill.lime{background:var(--lime);color:#101b2c}
.tlink{display:inline-flex;align-items:center;gap:4px;font-size:17px;font-weight:500;color:var(--accent)}
.tlink::after{content:"›";font-size:1.35em;line-height:0;transform:translateY(-1px);transition:transform .2s}
.tlink:hover{text-decoration:underline;text-underline-offset:3px}
.tlink:hover::after{transform:translate(3px,-1px)}
.kbd{display:inline-block;font:600 .72em var(--mono);padding:2px 7px;border-radius:6px;border:1px solid var(--line);color:var(--muted);vertical-align:middle}

/* ---------- Hero ---------- */
.hero{position:relative;padding:clamp(70px,11vw,130px) 0 0;text-align:center;overflow:hidden}
.hero .eyebrow{margin-bottom:14px}
.hero h1{font-size:clamp(3rem,9vw,7rem);letter-spacing:-.05em;line-height:1}
.hero .lead{max-width:720px;margin:24px auto 0;font-size:clamp(1.15rem,2vw,1.5rem);color:var(--muted);line-height:1.4;font-weight:500}
.hero-glow{position:absolute;left:50%;top:38%;width:min(1100px,140vw);aspect-ratio:2/1;transform:translateX(-50%);background:radial-gradient(closest-side,rgba(200,239,92,.35),rgba(79,224,205,.14) 55%,transparent);filter:blur(40px);z-index:-1;pointer-events:none}
:root[data-theme="dark"] .hero-glow{background:radial-gradient(closest-side,rgba(200,239,92,.22),rgba(79,224,205,.12) 55%,transparent)}

/* Escenario con la placa: se endereza al hacer scroll (--p de 0 a 1) */
.stage{--p:0;--mx:0;--my:0;position:relative;margin:clamp(40px,7vw,80px) auto 0;width:min(1000px,100%);perspective:1400px}
.stage-inner{position:relative;border-radius:var(--r-lg);background:radial-gradient(120% 120% at 50% 0%,#1b2433 0%,#07090d 70%);padding:clamp(24px,5vw,60px);box-shadow:var(--shadow-lg);transform:rotateX(calc((1 - var(--p)) * 24deg + var(--my) * -4deg)) rotateY(calc(var(--mx) * 5deg)) scale(calc(.84 + var(--p) * .16));transform-origin:50% 0;transition:transform .15s linear;will-change:transform;overflow:hidden}
.stage-inner::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:32px 32px;mask-image:radial-gradient(ellipse at center,#000 30%,transparent 80%);-webkit-mask-image:radial-gradient(ellipse at center,#000 30%,transparent 80%)}
.board{position:relative;width:100%;height:auto;filter:drop-shadow(0 30px 40px rgba(0,0,0,.6))}
.board .led-blue{animation:blink 1.6s steps(1) infinite}
.board .wifi path{stroke-dasharray:4 6;animation:dash 1.2s linear infinite}
@keyframes blink{50%{opacity:.15}}
@keyframes dash{to{stroke-dashoffset:-20}}
.chipset{position:absolute;inset:0;pointer-events:none}
.spec{position:absolute;display:flex;flex-direction:column;gap:2px;padding:10px 14px;border-radius:14px;background:rgba(255,255,255,.08);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid rgba(255,255,255,.14);color:#f5f5f7;text-align:left;opacity:calc(var(--p) * 1.4 - .3);transform:translateY(calc((1 - var(--p)) * 30px))}
.spec b{font-size:clamp(.95rem,1.6vw,1.25rem);letter-spacing:-.02em}
.spec span{font-size:.72rem;color:#a1a1a6;font-weight:500}
.spec.s1{left:3%;top:6%}.spec.s2{right:3%;top:6%}.spec.s3{left:3%;bottom:6%}.spec.s4{right:3%;bottom:6%}
@media (max-width:640px){.spec{padding:7px 10px;border-radius:10px}.spec span{display:none}}

/* ---------- Texto que se ilumina al hacer scroll ---------- */
.scrub{max-width:980px;margin:0 auto;font-size:clamp(1.8rem,4.4vw,3.6rem);font-weight:700;line-height:1.15;letter-spacing:-.035em}
.scrub span{opacity:.18;transition:opacity .3s}
.scrub span.on{opacity:1}

/* ---------- Cifras ---------- */
.stats{background:var(--night);color:var(--night-ink);padding:clamp(70px,10vw,120px) 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;text-align:center}
.stats-grid b{display:block;font-size:clamp(3rem,8vw,6rem);font-weight:700;letter-spacing:-.06em;line-height:1;background:linear-gradient(180deg,#fff,#8e8e93);-webkit-background-clip:text;background-clip:text;color:transparent}
.stats-grid b.word{font-size:clamp(2rem,4.6vw,3.6rem);letter-spacing:-.04em;padding-top:clamp(.5rem,2vw,1.4rem)}
.stats-grid b.lime{background:linear-gradient(180deg,#e4ff9a,#8fbf1f);-webkit-background-clip:text;background-clip:text}
.stats-grid span{display:block;margin-top:12px;color:var(--night-muted);font-size:clamp(.9rem,1.4vw,1.05rem)}
@media (max-width:760px){.stats-grid{grid-template-columns:repeat(2,1fr);row-gap:48px}}

/* ---------- Bento de asignaturas ---------- */
.bento{display:grid;grid-template-columns:repeat(4,1fr);grid-auto-rows:minmax(300px,auto);gap:20px}
.tile{--mx:50%;--my:50%;position:relative;display:flex;flex-direction:column;padding:clamp(24px,3vw,36px);border-radius:var(--r-lg);background:var(--card);box-shadow:var(--shadow);overflow:hidden;isolation:isolate;transition:transform .5s var(--ease),box-shadow .5s}
.tile::after{content:"";position:absolute;inset:0;z-index:-1;background:radial-gradient(500px circle at var(--mx) var(--my),rgba(200,239,92,.16),transparent 45%);opacity:0;transition:opacity .4s}
.tile:hover{transform:translateY(-6px) scale(1.01)}
.tile:hover::after{opacity:1}
.tile.dark{background:#0b0d12;color:#f5f5f7}
.tile.dark p{color:#a1a1a6}
.tile.big{grid-column:span 2;grid-row:span 2}
.tile.wide{grid-column:span 2}
.tile small{font:600 .74rem var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.tile.dark small{color:#86868b}
.tile h3{font-size:clamp(1.9rem,3.4vw,2.8rem);margin-top:8px}
.tile.big h3{font-size:clamp(2.4rem,5vw,4rem)}
.tile p{margin-top:10px;color:var(--muted);max-width:420px}
.tile .tlink{margin-top:16px;position:relative;z-index:2}
.tile .tlink.cover::before{content:"";position:absolute;inset:-2000px}
.tile .visual{margin-top:auto;padding-top:24px;position:relative}
.tile ul{list-style:none;margin:18px 0 0;padding:0;position:relative;z-index:3}
.tile li a{display:flex;justify-content:space-between;padding:9px 0;border-top:1px solid var(--line);font-size:.95rem;color:var(--ink-2)}
.tile.dark li a{border-color:#2d2d30;color:#d2d2d7}
.tile li a:hover{color:var(--accent)}
.tile.dark li a:hover{color:var(--lime)}
.fan{position:relative;height:clamp(200px,24vw,290px)}
.fan img{position:absolute;bottom:0;width:58%;aspect-ratio:4/3;object-fit:cover;object-position:top;border-radius:16px;box-shadow:0 20px 40px -14px rgba(0,0,0,.4);transition:transform .7s var(--ease)}
.fan img:nth-child(1){left:2%;transform:rotate(-8deg) translateY(10px)}
.fan img:nth-child(2){left:21%;z-index:2;transform:translateY(-8px)}
.fan img:nth-child(3){right:2%;transform:rotate(8deg) translateY(10px)}
.tile:hover .fan img:nth-child(1){transform:rotate(-12deg) translate(-14px,4px)}
.tile:hover .fan img:nth-child(3){transform:rotate(12deg) translate(14px,4px)}
.tile:hover .fan img:nth-child(2){transform:translateY(-18px) scale(1.03)}
.wave path{stroke-dasharray:900;stroke-dashoffset:900;animation:draw 3s var(--ease) forwards infinite alternate}
@keyframes draw{to{stroke-dashoffset:0}}
.boards{display:flex;justify-content:center;gap:8px;height:150px}
.boards img{height:100%;width:auto;object-fit:contain;filter:drop-shadow(0 16px 20px rgba(0,0,0,.35));transition:transform .6s var(--ease)}
.tile:hover .boards img:first-child{transform:translateX(-8px) rotate(-4deg)}
.tile:hover .boards img:last-child{transform:translateX(8px) rotate(4deg)}
.readout{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.readout div{padding:14px;border-radius:16px;background:#16181d;border:1px solid #23262d}
.readout b{display:block;font-size:clamp(1.15rem,1.9vw,1.6rem);white-space:nowrap;letter-spacing:-.04em;color:#c8ef5c;font-variant-numeric:tabular-nums}
.readout div:nth-child(2) b{color:#4fe0cd}
.readout span{font-size:.72rem;color:#86868b}
.readout .note{grid-column:1/-1;padding:0;background:none;border:0;font-size:.7rem;color:#6e6e73;display:flex;align-items:center;gap:6px}
.readout .note::before{content:"";width:6px;height:6px;border-radius:50%;background:#3cc58a;animation:blink 1.2s infinite}
@media (max-width:1000px){.bento{grid-template-columns:repeat(2,1fr)}.tile.big{grid-row:span 1}}
@media (max-width:640px){.bento{grid-template-columns:1fr}.tile.big,.tile.wide{grid-column:auto}}

/* ---------- Historia con panel fijo ---------- */
.story{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(30px,6vw,90px);align-items:start}
.story-stage{position:sticky;top:calc(50vh - min(260px,32vh));height:min(520px,64vh);border-radius:var(--r-lg);background:#0b0d12;box-shadow:var(--shadow-lg);overflow:hidden;color:#f5f5f7}
.scene{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;padding:clamp(22px,4vw,44px);opacity:0;transform:scale(.96);transition:opacity .6s var(--ease),transform .6s var(--ease);pointer-events:none}
.scene.on{opacity:1;transform:none;pointer-events:auto}
.scene small{font:600 .72rem var(--mono);letter-spacing:.1em;color:#86868b;text-transform:uppercase}
.scene h4{margin:8px 0 18px;font-size:1.5rem;letter-spacing:-.03em}
.steps{display:flex;flex-direction:column}
.step{min-height:70vh;display:flex;flex-direction:column;justify-content:center;opacity:.25;transition:opacity .5s}
.step.on{opacity:1}
.step .num{font:600 .8rem var(--mono);color:var(--accent)}
.step h3{font-size:clamp(2rem,4vw,3.2rem);margin-top:10px}
.step p{margin-top:16px;font-size:clamp(1.05rem,1.5vw,1.25rem);color:var(--muted);max-width:460px}
@media (max-width:860px){
  .story{grid-template-columns:1fr}
  .story-stage{order:-1;top:64px;height:46vh;z-index:2}
  .step{min-height:60vh}
}
/* Escenas */
.theory{display:grid;gap:10px}
.theory div{display:flex;align-items:center;gap:14px;padding:14px 16px;border-radius:14px;background:#16181d;border:1px solid #23262d;font-size:.95rem}
.theory i{flex-shrink:0;width:30px;height:30px;border-radius:9px;display:grid;place-items:center;font-style:normal;font-weight:700;background:#25351a;color:#c8ef5c}
.pwm{display:grid;gap:18px}
.pwm-row{display:flex;align-items:center;gap:22px}
.led{width:64px;height:64px;border-radius:50%;background:radial-gradient(circle at 35% 30%,#fff 0,#e4ff9a 18%,#8fbf1f 60%);box-shadow:0 0 calc(var(--duty) * 70px) calc(var(--duty) * 18px) rgba(200,239,92,calc(var(--duty) * .8));opacity:calc(.25 + var(--duty) * .75);transition:box-shadow .15s,opacity .15s;flex-shrink:0}
.pwm-val b{display:block;font-size:2.6rem;letter-spacing:-.05em;font-variant-numeric:tabular-nums}
.pwm-val span{font-size:.8rem;color:#86868b}
.pwm svg{width:100%;height:70px;background:#0f1218;border-radius:12px;border:1px solid #23262d}
.range{-webkit-appearance:none;appearance:none;width:100%;height:6px;border-radius:6px;background:linear-gradient(90deg,#c8ef5c var(--fill,50%),#2d2d30 var(--fill,50%));outline-offset:6px}
.range::-webkit-slider-thumb{-webkit-appearance:none;width:26px;height:26px;border-radius:50%;background:#fff;box-shadow:0 2px 10px rgba(0,0,0,.4);cursor:grab}
.range::-moz-range-thumb{width:26px;height:26px;border:0;border-radius:50%;background:#fff;cursor:grab}
.photo{position:absolute;inset:0}
.photo img{width:100%;height:100%;object-fit:cover}
.photo figcaption{position:absolute;left:16px;bottom:16px;padding:8px 12px;border-radius:10px;background:rgba(0,0,0,.6);backdrop-filter:blur(8px);font-size:.8rem}
.code{font:500 clamp(.78rem,1.3vw,.92rem)/1.65 var(--mono);color:#d2d2d7;white-space:pre;overflow:hidden}
.code .k{color:#ff7ab2}.code .f{color:#67b7ff}.code .s{color:#c8ef5c}.code .c{color:#6e6e73}
.caret{display:inline-block;width:8px;height:1.1em;background:#c8ef5c;vertical-align:text-bottom;animation:blink 1s steps(1) infinite}

/* ---------- Carrusel ---------- */
.rail-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:28px}
.rail-head h2{font-size:clamp(2.2rem,5vw,3.6rem)}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{min-height:36px;padding:0 16px;border-radius:999px;background:var(--card);box-shadow:inset 0 0 0 1px var(--line);font-size:.9rem;font-weight:500;color:var(--ink-2);transition:all .25s}
.chip:hover{box-shadow:inset 0 0 0 1px var(--ink-2)}
.chip[aria-pressed="true"]{background:var(--ink);color:var(--bg);box-shadow:none}
.rail{position:relative}
.track{display:flex;gap:20px;overflow-x:auto;scroll-snap-type:x mandatory;scroll-padding-left:max(22px,calc((100vw - 1180px) / 2));padding:10px max(22px,calc((100vw - 1180px) / 2)) 30px;scrollbar-width:none}
.track::-webkit-scrollbar{display:none}
.card{--mx:50%;--my:50%;--rx:0deg;--ry:0deg;position:relative;flex:0 0 clamp(270px,30vw,360px);scroll-snap-align:start;display:flex;flex-direction:column;border-radius:var(--r-lg);background:var(--card);box-shadow:var(--shadow);overflow:hidden;transform:perspective(900px) rotateX(var(--rx)) rotateY(var(--ry));transition:transform .4s var(--ease),box-shadow .4s}
.card:hover{box-shadow:0 30px 60px -24px rgba(0,0,0,.35)}
.card::after{content:"";position:absolute;inset:0;pointer-events:none;background:radial-gradient(420px circle at var(--mx) var(--my),rgba(255,255,255,.22),transparent 40%);opacity:0;transition:opacity .3s}
.card:hover::after{opacity:1}
.card[hidden]{display:none}
.card-media{position:relative;aspect-ratio:4/3;background:linear-gradient(150deg,#15304a,#0b1422);overflow:hidden}
.card-media img{width:100%;height:100%;object-fit:cover;object-position:top;transition:transform .8s var(--ease)}
.card:hover .card-media img{transform:scale(1.06)}
.card-media.pair{display:flex;align-items:center;justify-content:center;gap:4px;padding:18px}
.card-media.pair img{width:48%;object-fit:contain;filter:drop-shadow(0 14px 18px rgba(0,0,0,.6))}
.card-media svg{width:100%;height:100%}
.card-body{display:flex;flex-direction:column;flex:1;padding:22px 24px 24px}
.card-body small{font:600 .7rem var(--mono);letter-spacing:.1em;color:var(--accent);text-transform:uppercase}
.card-body h3{font-size:1.4rem;letter-spacing:-.025em;margin-top:8px}
.card-body p{margin-top:8px;font-size:.95rem;color:var(--muted)}
.card-body .tlink{margin-top:auto;padding-top:16px;font-size:.95rem}
.card-body .tlink::before{content:"";position:absolute;inset:0}
.rail-nav{display:flex;justify-content:flex-end;gap:10px;margin-top:6px}
.rail-btn{display:grid;place-items:center;width:44px;height:44px;border-radius:50%;background:var(--card);box-shadow:inset 0 0 0 1px var(--line);color:var(--ink);transition:background .2s,opacity .2s}
.rail-btn:hover{background:var(--bg-2)}
.rail-btn:disabled{opacity:.35;cursor:default}
.rail-btn svg{width:18px;height:18px}
.rail-empty{display:none;padding:60px 20px;text-align:center;color:var(--muted)}
.rail-empty.show{display:block}

/* ---------- Filas de producto (páginas de asignatura) ---------- */
.feature{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(30px,6vw,80px);align-items:center;padding:clamp(40px,6vw,70px) 0}
.feature + .feature{border-top:1px solid var(--line)}
.feature.flip .f-media{order:2}
.f-media{position:relative;border-radius:var(--r-lg);overflow:hidden;aspect-ratio:16/11;background:linear-gradient(150deg,#15304a,#0b1422);box-shadow:var(--shadow-lg)}
.f-media img{width:100%;height:100%;object-fit:cover;object-position:top;transition:transform 1.2s var(--ease)}
.feature:hover .f-media img{transform:scale(1.04)}
.f-media.pair{display:flex;align-items:center;justify-content:center;gap:10px;padding:30px}
.f-media.pair img{width:46%;height:auto;object-fit:contain;filter:drop-shadow(0 20px 26px rgba(0,0,0,.6))}
.f-media svg{width:100%;height:100%}
.f-copy small{font:600 .76rem var(--mono);letter-spacing:.1em;color:var(--accent);text-transform:uppercase}
.f-copy h3{font-size:clamp(2rem,4vw,3.2rem);margin-top:10px}
.f-copy p{margin-top:16px;font-size:1.12rem;color:var(--muted)}
.f-copy .tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.f-copy .tags span{padding:5px 12px;border-radius:999px;background:var(--bg-2);font-size:.8rem;font-weight:500;color:var(--ink-2)}
.f-copy .ctas{justify-content:flex-start;margin-top:26px}
@media (max-width:820px){.feature{grid-template-columns:1fr}.feature.flip .f-media{order:0}}

/* Visual de la cabecera de asignatura */
.hero-visual{position:relative;margin:clamp(40px,7vw,80px) auto 0;width:min(1060px,100%);height:clamp(260px,40vw,460px)}
.spread img{position:absolute;top:10%;width:44%;aspect-ratio:4/3;object-fit:cover;object-position:top;border-radius:20px;box-shadow:var(--shadow-lg);transition:transform .1s linear}
.spread img:nth-child(1){left:28%;z-index:3;transform:translateY(calc((1 - var(--p,0)) * 20px))}
.spread img:nth-child(2){left:28%;z-index:2;transform:translateX(calc(var(--p,0) * -58%)) rotate(calc(var(--p,0) * -6deg)) scale(.92)}
.spread img:nth-child(3){left:28%;z-index:2;transform:translateX(calc(var(--p,0) * 58%)) rotate(calc(var(--p,0) * 6deg)) scale(.92)}
.versus{display:flex;align-items:center;justify-content:center;gap:clamp(10px,4vw,50px)}
.versus img{height:auto;max-height:clamp(200px,34vw,400px);width:auto;max-width:42%;filter:drop-shadow(0 30px 40px rgba(0,0,0,.45));transition:transform .1s linear}
.versus img:first-child{transform:translateX(calc((1 - var(--p,0)) * 60px)) rotate(calc((1 - var(--p,0)) * -6deg))}
.versus img:last-child{transform:translateX(calc((1 - var(--p,0)) * -60px)) rotate(calc((1 - var(--p,0)) * 6deg))}
.versus .vs{font-size:clamp(1.6rem,4vw,3rem);font-weight:800;letter-spacing:-.05em;color:var(--muted)}
.spectrum{position:absolute;inset:0;border-radius:var(--r-lg);background:radial-gradient(120% 120% at 50% 0%,#14263a,#05070b 70%);overflow:hidden;box-shadow:var(--shadow-lg)}
.spectrum .bars{position:absolute;left:5%;right:5%;bottom:12%;height:55%;display:flex;align-items:flex-end;gap:1.2%}
.spectrum .bars i{flex:1;border-radius:4px 4px 0 0;background:linear-gradient(180deg,#c8ef5c,#4fe0cd);animation:eq 1.6s ease-in-out infinite alternate;transform-origin:bottom}
@keyframes eq{from{transform:scaleY(.25)}to{transform:scaleY(1)}}
.spectrum svg{position:absolute;inset:0;width:100%;height:100%}
.spectrum .tag{position:absolute;left:5%;top:9%;font:600 .75rem var(--mono);letter-spacing:.1em;color:#86868b}

/* Cambio de asignatura */
.switch{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.switch a{position:relative;display:flex;flex-direction:column;gap:6px;min-height:170px;padding:26px;border-radius:var(--r);background:#161617;color:#f5f5f7;transition:transform .4s var(--ease),background .3s}
.switch a:hover{transform:translateY(-6px);background:#1f1f22}
.switch a b{font-size:1.8rem;letter-spacing:-.04em;margin-top:auto}
.switch a span{font-size:.9rem;color:#a1a1a6}
.switch a small{font:600 .7rem var(--mono);letter-spacing:.1em;color:#86868b}
.switch a[aria-current="page"]{background:var(--lime);color:#101b2c}
.switch a[aria-current="page"] span,.switch a[aria-current="page"] small{color:#3d5410}
@media (max-width:860px){.switch{grid-template-columns:repeat(2,1fr)}}

/* Banda final */
.closing{background:var(--night);color:var(--night-ink);text-align:center;padding:clamp(90px,13vw,160px) 0;overflow:hidden;position:relative}
.closing h2{font-size:clamp(2.6rem,7vw,5.4rem);letter-spacing:-.05em}
.closing p{margin:18px auto 0;max-width:600px;color:var(--night-muted);font-size:1.2rem}
.closing .pill{background:var(--lime);color:#101b2c}
.closing .tlink{color:var(--lime)}
.closing .glow{position:absolute;left:50%;bottom:-40%;width:900px;height:600px;transform:translateX(-50%);background:radial-gradient(closest-side,rgba(200,239,92,.25),transparent);filter:blur(30px);pointer-events:none}

/* ---------- Pie ---------- */
.footer{background:var(--bg-2);color:var(--muted);font-size:12.5px;padding:34px 0 80px;border-top:1px solid var(--line)}
.footer-cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:28px;padding-bottom:22px;border-bottom:1px solid var(--line)}
.footer h4{margin:0 0 10px;font-size:12.5px;font-weight:600;color:var(--ink)}
.footer ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.footer a:hover{color:var(--ink);text-decoration:underline}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;padding-top:16px}
@media (max-width:760px){.footer-cols{grid-template-columns:1fr 1fr}.footer-cols>div:first-child{grid-column:1/-1}}

/* ---------- Aparición ---------- */
.reveal{opacity:0;transform:translateY(40px);transition:opacity 1s var(--ease),transform 1s var(--ease);transition-delay:var(--d,0s)}
.reveal.in{opacity:1;transform:none}
.no-js .reveal{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .reveal{opacity:1;transform:none}
  .stage{--p:1!important}
  .scrub span{opacity:1}
}
@media print{.reveal{opacity:1;transform:none}.stats,.closing{background:#fff;color:#000}}

/* Refinamiento común del portafolio */
.hero{background:radial-gradient(ellipse at 50% 0%,color-mix(in srgb,var(--cyan) 8%,transparent),transparent 65%)}
.eyebrow{letter-spacing:.08em;text-transform:uppercase;font-size:.78rem}
.card{border:1px solid color-mix(in srgb,var(--line) 60%,transparent)}
.card-media img{object-fit:contain;object-position:center;padding:14px}
.card:hover .card-media img{transform:scale(1.025)}
.section{scroll-margin-top:28px}
.pill{box-shadow:0 6px 20px -12px var(--ink)}
@media(max-width:600px){.wrap{width:calc(100% - 32px)}.headline h2{font-size:clamp(2rem,8vw,3rem)}.hero h1{font-size:clamp(2.8rem,12vw,4rem)}}